Free water molecules will diffuse out of their vessel or container when the difference in the concentration of solute outside of the membrane exceeds the internal concentration.
Free water molecules are what we describe as water molecules whose movement is not restricted by their environment. The way in which free water molecules diffuse is through osmosis. This can be described in simple terms as a process where a solvent moves to the other side of the membrane, where the concentration of solute is higher.
In order for free water molecules to diffuse through osmosis, the surrounding membrane must be semipermeable. This means that the membrane will allow the free passage of certain molecules, like water, but most molecules will not be able to cross it. Some of these molecules can still cross the membrane through other processes such as:
- Active Transport
- Endocytosis
- Exocytosis,
While others don't cross. This is what causes the concentration of solute to build up on one side, which triggers osmosis and the water to cross the semipermeable membrane.
Therefore, we can say that the free water molecules are diffusing out of the vessel because the concentration of solute is higher on the outer side of the cell membrane, causing water molecules to diffuse out through osmosis.
For more on the behavior of water molecules visit:
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